#include <stdio.h>
#include <string.h>

int main(void)
{
	char buff[40];

	memset(buff, '\0', sizeof(buff));

	//setvbuf(stdout, buff, _IOFBF, 1024);
	setvbuf(stdout, buff, _IONBF, 1024);

	fprintf(stdout, "111111111111\n");

	fflush(stdout);

	fprintf(stdout, "Enter any character before the line is displayed！\n");
	
	getchar();
	
	return 0;	
}
